If the malware in question still allows assorted remote desktop apps to run/function (many might be blocked, so will not!), and still allows downloading/running of common anti- malware tools, assuming one's 'virus' is detectable, and if detectable, assuming it can be easily removed....
Then...
Possibly....?
As to 'who can you trust', you already mentioned it being a friend doing the connection to your computer, right?
As long as you can access internet and still do downloads, do a Defender (now simply called MS Security) scan, then go to:
(download/install/run malwarebytes antimalware)
www.malwarebytes.com
Also at malwarebytes' site, look for/download/run AdwCleaner...